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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20141fde6ed3e8f1c3111c275127b7e16ccbce3db264ece1b0490fa4d0fa8517' 
  AND token = '1CbqgtmDlCsPYK4Zsoz7XD8cSq4NkycDJzm8ltvucc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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