SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f45805539b5d03afb884557a1107ccfc517bef8cbc672223afa262a879971455' 
  AND token = 'tEyuJg7RFckwvs064khZbJG1Y5hALwGU+PM6/Q5zqG4=' 
  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"
    }
  }
}