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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8586d6257353483841b965316982467f15fa78eb320f2f798220261f0e827e4' 
  AND token = 'oXOmmXKsrN1NCAxy2DSIEagh4801FAmfcT7N7jhQjIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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