SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '780e03f3b79b9546089320edd8682182ae4431387bdecc9760758cc20f0603fc' 
  AND token = 'DrKPjjgpViB7X5L+j5EmdQauS6hT6/Wr6R+NnHmvXIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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