Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a0aa0897a5ce28842e2c7be1a0cfa87751a744378ccbe0931640609ba9fa200' 
  AND token = 'DhHuTNrUmRLyyKgkHs+MNE2Ajhl4h0trCxBhdDFGVIk=' 
  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"
    }
  }
}