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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b339665374836b89aac1e309aecf22a90b078f41ab43b697af1a6af6d113d388' 
  AND token = 'VKJsEbIHKIQGAugKN3O9dSa1fb9WPhZa0i8HThZbBtQ=' 
  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"
    }
  }
}