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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f276021744496467c2e21d2d502d5b80de6bc731e0eadefb98d9e0cacc52c72' 
  AND token = 'vVFW+We0nIEu1Az9m4ylXBN/D+XvPB/jT0v8W75xRPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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