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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d09c0f140ef1003cfb35d52df5846092ddaeb50666756bd9dcf49c0cd650bf1' 
  AND token = '/7nJHHgfN3rJm9O5gwtATH0+jHwhtKiqO/05XmOyx30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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