Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '424e7d1b2e6db2cf6427afde4843c5cf9252c64b8d51a162a576f11aea61fba8' 
  AND token = 'xlDm1T1/jv5EyZ5taHdtiLIce5lGNf6GTsxw8yLAuGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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