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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43edd811677554b281f06a80d040aa7a8817aa20bf7ae99f80658b1f213abbfa' 
  AND token = '4fS8azlQQEEO8oqacStoje11I2lpOIqb2cr62KhlGvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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