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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd475bd49adb44c41d590fbc69147cba326ec4fd5eb373777d77837c4bd52a15e' 
  AND token = 'WcsndZX/kWctbBd25ErwAYR0h46qwP/upSs6JXKh8bw=' 
  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"
    }
  }
}