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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb084d8e2bfd0cb8a8e4355da88c973f342ce2fdea1e200cec6b28acd334d93f' 
  AND token = 'QbVIoFOaMNhGjaCB0qITzmqGKb4l3j8ReZFBMxj7qCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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