SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3469dae286312764ed319f7d0b5a3828ef554a9763589d99c52da2444c9405ae' 
  AND token = 'u2Aqrr7Gt7Nb6ftBTJMvQAKnfUjVXJKP7h3OXfvyuSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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