Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c0b5309850b98eabf287582543d2f973aceedf4684e213fdfc5907b39b836ef' 
  AND token = 'Y6q99X5p6njw4QxN6TSB00z0ZR11h+bubhIQ+ELNmBs=' 
  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"
    }
  }
}