Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e7924f001849c09825a1f071e472c56535acfb73a37b8bd2eeea73243e3f7e5' 
  AND token = 'c6LDgQ/ICd3tEwGyMkXG0Ee+OYOzBJ+krBiMy5rGPPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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