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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3dafb6d6db1ded791297617186a80e90289ee9cad0dd55307a1fab52601b2a4' 
  AND token = 'JtfJVc/dDA/yiJY/EJHnHH2ZRMeQUwSlip5ck3yVkvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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