SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c96f19a82cf18ca5747fac997dc6431afb7e653b5c4a3c882a392b00190b752' 
  AND token = 'XGDA7SnmjhdFD6BLSHFZg3S+QU6l1mOnpqeqIEQGrN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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