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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f38d7e5550d9eaab7ba6e2467b6e02f110db2f6a5cace05b3a6622fca4f73e7' 
  AND token = 'Gi/zUodP3dxvQLU1+lkg6/nRFHMqyh8cxw4yS86tdg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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