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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '552f730b0d7417eaf85ca7a12b77090fb0215074f7ba500e50e71bbab01178a5' 
  AND token = 'vAHkjxJzN66yx4QCM8Eqymf79vP1VD19hiNBSvV62vI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}