SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69b01f9f08834a379fe3037bb006d8877137562bd07075a08f69587ca38e479c' 
  AND token = 'BDmMphmT3X48Fw3QdvwBo2YpiUJytOU4MvctG6VKh+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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