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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a38fe7df6776b278554847246908a27085488d5d337418ff2a6c7fa1ece37188' 
  AND token = '9NM/Jfgd4476iDzD7KsIbf9MG5pT262H8EYm8EntMGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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