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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6e18df7c769d629a4428314805c974b7d2c9127d1471c2dd22493133591c252' 
  AND token = 'py1pOq9V8mOY80Limb9eQwo36sjJ39koaXcBM4bd9Xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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