Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af284d5a60f59a71f0cbd0b1418b931776b1747228f4831e6c2c923ec03b7c87' 
  AND token = '8Pbx+hskUht7eIAf/dRDrIjxxrzZyH6dEOvpeDijd5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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