Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e81f70530a26b02e4421d4bd8582d6aca07d07f9671a4e665a95e80bb6faa3a2' 
  AND token = 'ha7iZ0nbTPl7Gu4pnP9Cmu2LpNUaMzFqQs130M1u8S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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