SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c10554eab7eefffcf7f994162459acef47c6479a3ad228417883c6f8eef125a' 
  AND token = 'bLzZhOY5mJGDtXf2/J6m8N8Xyj4SgSuQp3oDeEB+ovc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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