SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38324961b3fdc1f54a8f0aa0cc59684964a3804461781d8c91dc1519a2b76cd8' 
  AND token = 'g6nnIQ4bgeQpmsIPqOV9GE/ilGzEfnLJYyZpR7YLOrE=' 
  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"
    }
  }
}