Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4f8cbebab8a8f683b236b1f1a634dcc95ad2527096712d1d041ec1b3a691399' 
  AND token = 'MfyD9OClR1mnMtDZPFlhwGV2t1xCtE3SB1kjiqO2pVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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