Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c281875c5580e547961fd17159ff4710cc7c295165ccd601e1082699500a9ffd' 
  AND token = 'LOZqmXxFI+C7LpNkqpVmHAdmnAotg4k5Ev8gAXXUMY0=' 
  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"
    }
  }
}