Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c81c95cccf9a5a5eaf1fb255001f7c11842812a61b9ded85e77954a6df78b84b' 
  AND token = 'hITS4eeUKX81Cu7EbIRWuICkPNEv2FCno30FlIGjpqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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