Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d25029229fbe6daccf4d2433cf17f311faee7465c451828f4768f347cfa7893' 
  AND token = 'Sl/ozBKiQrcYqilqEKZ9FSc0sVKEuSzDAUra67xGt1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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