Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71d9584d3cde74f2dee52add81d9049e5571de41e23075d3b6482c790f6a32cc' 
  AND token = 'GGcmWT6xVaA3z63DqXEWk7xrS5diGsc0zsONY60oV+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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