SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c095cfca6683a9c2522e574e2c8ce42367a58771214399164915925feb2ad6b6' 
  AND token = 'lwqhFI1cYg/OGtGor6mmsjwa+DU6fHKrJQaA/X4q0XA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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