Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2b91210678b062727dacb97ad936e2f4aa8d0f3c851150b775ff38f2201d5fe' 
  AND token = '7lcRwhIiVGmUqI2c9gtZvveq7Rrrj7qvXD2e4TGhNkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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