Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b450c5f16ae500406c743ecaf40efd87faa20c55a8b6cd368d7d525ebada6236' 
  AND token = 'FEjkx3oslVGcxt/PnYX5fvo4jeLF+78e9cqps8SVIrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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