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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4713f7a0184d286c73f8fa6c46637800fb749ea46d779f3398f8b8d086cae2f0' 
  AND token = 'CTYU9gO+wxqvD3RwtZdOo1kHmMWY33dwpAyZupdmj/o=' 
  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"
    }
  }
}