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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64768a2e33cfe8a6e5cf9ed532a802f1f1dc4fe64eae56a50498a75f01ddb8cf' 
  AND token = '9E1pe+J0dHv2H5I5qiOeb1+Cy0U/aTSu4iOi3EOYLc8=' 
  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"
    }
  }
}