Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61f675e4f8ec850e481ffa62c5be76f87bcb04adc71b20f37409ac7f435a1d84' 
  AND token = 'mr3haWus3gpUdfq24gMgvEqJLy9X+BnpR0sEodBkTPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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