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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bb7da77e74b8224272283c71deea5ee0cea2d2165bdc7867ba3d45d99c800cd' 
  AND token = 'ifMp71OKEDwfSjX0XHKCf5htndG8IAWQqmbob+FP4P0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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