Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e87043fbad66c4d08cdf8073cb2aedf646e9d4d530a967716d30ce081d7126c' 
  AND token = 'HwHdw37AN5HdTFNhvZq1bXQgs3W4GYBUDuYg29rLKzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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