Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f728c72f356cc2557a4f8f3c09f6564f07ac7f678a61fb3940dc0e56b619b44' 
  AND token = 'sZnqFWkYsnNhUDAo2dcfOumkIsQTm9ZgvQWkLVaGCq8=' 
  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"
    }
  }
}