Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7456de2e7bc47e27633939c3052a15ff936207ff47d30db1e0c6426de1c6598' 
  AND token = 'neDJCD8Ybop4ReoeVqLNFn5RPHKhVk3YLFXb0XP1Lrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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