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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69b228a442a706beca864dcc5eef5f861ee1773cb7c311e04e5c147660a01d97' 
  AND token = 'O+jZ1FMsqljUARaQ/h2eJF/twlrqlI0vq3F77kyJIMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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