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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b846deb8e19586ce3577e9b62c2e797b555eeccf9023e7a82eed6a6bf9e7655' 
  AND token = 'MXT2reK3PooJqFgwLNz4PHq85/uCW+M5eCxH9CCVqpE=' 
  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"
    }
  }
}