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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bf4e383e2c3305072e7e8f8adb6fe46ffad22bfb0eb6b3887a36aa65657f5a7' 
  AND token = '2yIccKmeiSyh5qSj8Kh8CDlj7bGMwJmHsR7h72l6H7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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