Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '838707e542e63253fddcc7660cceb1b5681e6a6deaae12dcd7dff9ae7cbbc763' 
  AND token = 'decXCO/OLA4RWRf/PNxQCiXZw911HZdtbB5rEEGsjqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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