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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '636c4f867434b427fd5d33fbac95e9c88bf8707ba72b8feb6de579f8896fc49d' 
  AND token = 'oaCR8X9B47aip2iGicl8oN2qwm+jWhIxXMdzPJzNhOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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