Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c8c074c0b943504b6d2e41c2e7a21d91cf8e9a9b6e28c594ecdf0fb277408ce' 
  AND token = 'TQjU7tAxUlwCSdpKKsBBlYcxuI64mLtSBJAeJPD1Z/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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