Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7736be750643a4aeee4ec9fe4861662aa9a567dbadc7e548481b75d489b21729' 
  AND token = '78ROmy+kShTjG4g8ioIsFy/nEbGqc4/kVL3A3aK8Oks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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