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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87daab7a7c101dd4ce1d77489fc68cd43df0a116133fa0116ab7fad493b8e750' 
  AND token = '17yQRRrSBTAKNzirylkVRjscu4V4Dah/soRROHAgNjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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