Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '695095f8ee16c9f2014e56fe3f3d2c5c62bb5b90e106d2a58298720a291fbc24' 
  AND token = 'v5Cm6p6qYrC1TLrEupyU1zy0+kBU1CwR4WAiKyn3L0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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