Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36a4a62cc7df466ffc4712d10db52a2c5ff662f38c0b56d713ff95cb5d329036' 
  AND token = '58MTN2jkht+jNVM921L6o09JDdltHg7kAJQLBI/M7SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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