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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f35f88e2a39913ad44533e9ea005ffea5cf257209ec9cf48399b27c700ca5a9' 
  AND token = '8c9AgoDtNK+k2GO5chhjExZmzCA+CjakGC+oV8W816g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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