Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c0e96917a6c5caec0b86c8a456283c399b8330f34e56535c124d143fff3afa4' 
  AND token = 'XD+JHOKzEb0Y58wYT5LjKB3Hfqsa+pKcCn+P08msVKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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