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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e80bc5b92de8ed81fb6a32e819296d028fa26ef2d5f8dfb43ed09fda2b16fc0d' 
  AND token = 'j4hei4iXkvrnUTp35TifYSblmWHfpU2jWe68eXRvfuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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