Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c30b0dfe31423d8e0ac4f49b3b8cef7a8245bafc77f22bf471acbf5656337169' 
  AND token = 'RQXQ4QrClvQi2lgMTSpZqfRstaK2OBBBlioaCkgQeT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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