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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49f351b642533b076ebabf273c3e7a7b710a10d6c52e05583f33bc4908b84d34' 
  AND token = 'N6aT+1rIM15l/NNiH1ad0wsYyZL0Dso7y+XiPj2+gOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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