SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a151a79254634155c4c5d9eb65b7fc0daf22b4c2b1a06b745d9a1c5cf01668f' 
  AND token = 'Sq7LDsOwrRjhVZoBLhpWlgLvjklQ2dPRherG9zjx09U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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