Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd78daf6ff09d197eedf3210321cef4c818103915caea6e47b80061a59156f44' 
  AND token = 'AURhPpJbXGQ2L1ATHbtsmFBkVg2U+CaRyNc+IZ8+It4=' 
  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"
    }
  }
}