Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37568a1621059166aa8fdad90d5a0b72155f0b3d9060e46ffb633ecdfe3aef5e' 
  AND token = 'EqK5J3i805cclHRqj2kWbbu/UJv+oSjd3MyCQQFjYOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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